YJ's SPOA or SPUA is a vast improvement over stock. probably the softest avalable (other than a LA coily). I run YJ's SPOA and the ride is super plush, so plush that I needed some very stiff shocks just to damp the spring sufficiently. You mention low, keep them SPUA and you'll be very happy. For a cheaper setup, run rear springs up front and get cj front springs and mount them in the rear, lots of guys are happy with this setup, too.